Update CONTRIBUTING.md
Update CONTRIBUTING.md

added flight manual to Your First Code Contribution
AdrianVovk/substance-ide,kevinrenaers/atom,liuderchi/atom,brettle/atom,brettle/atom,decaffeinate-examples/atom,AlexxNica/atom,bolinfest/atom,me-benni/atom,Mokolea/atom,tjkr/atom,PKRoma/atom,tjkr/atom,rlugojr/atom,t9md/atom,stinsonga/atom,andrewleverette/atom,atom/atom,liuderchi/atom,stinsonga/atom,gontadu/atom,FIT-CSE2410-A-Bombs/atom,ardeshirj/atom,gontadu/atom,helber/atom,Arcanemagus/atom,andrewleverette/atom,decaffeinate-examples/atom,brumm/atom,rlugojr/atom,t9md/atom,helber/atom,andrewleverette/atom,gontadu/atom,AlexxNica/atom,bj7/atom,ardeshirj/atom,bsmr-x-script/atom,bolinfest/atom,liuderchi/atom,AdrianVovk/substance-ide,bj7/atom,AdrianVovk/substance-ide,Arcanemagus/atom,brumm/atom,helber/atom,atom/atom,bolinfest/atom,kevinrenaers/atom,stinsonga/atom,Mokolea/atom,Ingramz/atom,AlexxNica/atom,xream/atom,Ingramz/atom,sotayamashita/atom,CraZySacX/atom,ardeshirj/atom,t9md/atom,CraZySacX/atom,FIT-CSE2410-A-Bombs/atom,brumm/atom,PKRoma/atom,Mokolea/atom,bj7/atom,decaffeinate-examples/atom,CraZySacX/atom,liuderchi/atom,sotayamashita/atom,tjkr/atom,bsmr-x-script/atom,Arcanemagus/atom,atom/atom,sotayamashita/atom,stinsonga/atom,me-benni/atom,rlugojr/atom,xream/atom,decaffeinate-examples/atom,FIT-CSE2410-A-Bombs/atom,kevinrenaers/atom,Ingramz/atom,me-benni/atom,bsmr-x-script/atom,PKRoma/atom,xream/atom,brettle/atom